These very advanced compositions make bigger demands on technique—it's likely that a lot of experience is necessary to successfully tackle these pieces.
They are not impossible to learn, not by a long shot! I've still taken great care to write even this very advanced music in such way as to make it enjoyable to play. Still, compared to the rest of my compositions, these require more experience. There are some bigger stretches, more barré passages, and some tremolo, too! Have fun!